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根据 10根试桩静载荷试验和桩身应力测试结果 ,在对桩侧极限摩阻力预测技术系统分析的基础上 ,研究了粘性土中LDBPs桩侧极限摩阻力的预测方法和指标确定 .针对硬塑状态的粘性土 ,提出了不排水强度指数 μ的概念 ,综合了粘性土不排水条件下内摩擦角和粘聚力 .基于这一概念 ,对传统的“α法”进行了扩展 ,使之更加有效地应用于粘性土中LDBPs桩侧摩阻力的预测 .同时还对SPT锤击数N预测粘性土中LDBPs的桩侧摩阻力进行了统计分析 ,并对粘土和亚粘土分别提出了相应的回归公式
According to the static load test of 10 test piles and the test results of pile stress, the prediction method and index of ultimate friction of LDBPs pile in cohesive soil are studied based on the systematic analysis of prediction technology of ultimate friction resistance of pile side. Plastic state of the clay, put forward the concept of undrained strength index μ, the combination of undrained cohesive soil under the conditions of internal friction angle and cohesion.Based on this concept, the traditional “α method” has been extended to make it It is more effective to predict the frictional resistance of LDBPs in cohesive soil.At the same time, the axial friction of LDBPs in cohesive soil is predicted by SPT hammering number N, and the corresponding frictional resistances of clay and clay Regression formula